One problem related to coolant leaking has been reported for the 2004 Chevrolet Colorado. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Chevrolet Colorado based on all problems reported for the 2004 Colorado.
Truck has 25,000 miles. I do not drive it often because fuel economy has never been as advertised, no better than 15 mpg. When it worked, it was fun to drive. Now fails inspection because the frame is severely rusted, my truck is now unsafe. Not cost effective to repair, I have to sell as scrap. Radio replaced once. Blower works but very noisy. Abs sensors were replaced after 10,000 miles and need replacement again. I have replaced inner and outer tie rods after 21k miles. I have replaced gas tank gasket and exterior cab brake light. Also replaced transmission shifter cable due to rust. Tube on rack and pinion rusted and replaced. Tiny coolant leak that I cant find. All I can remember. Most faulty vehicle I have ever owned. Never buy a first year model of any vehicle.